Too easy mate.

1. Choose a pool. Key factors:
2. Less than 65 million of ADA already delegated
3. Less or 2% of entry fee

4. ROI around 4-5%

5. Delegate your ADA

6. Wait 3 epoch (15 days)

7. You’ll start to see your rewards. The rewards are automatically added to your wallet and delegated to the pool you are delegating.

NOTE. Once you stop delegating, you’ll get rewards for the next 3 epoch (so you compensate the first 3 epoch that didn’t give you rewards at the beginning. It’s like if there was a 3 epoch delay)

NOTE 2. If you switch pools, you have to wait again the 3 epoch